The clients use a metaserver to find out what servers are out there, ours is listed as Crossciv, Freeciv Galactic Milieu.

But, it has fantasy as well as science fiction milieus. Using the old classic character-creation method where creating your character is done on the server you choose milieu buy your choice of race/species and profession, basically anything other than a non-magical human is considere fantasy and lands on a fantasy world instead of in the science-fictional galactic milieu.

The newfangled character creation method where race and profession and stats are all done in the client kind of messes with that currently, as the programmers didn't realise anyone was actually using the ability to steer characters to different starting locations based on their race and profession. So until some mechanism is added for filtering access to areas based on race and profession anyone using the newfangled, client-side character-creation routine ends up in the fantasy world even if they are a plain old non-magical human thief swashbuckler ninja warrior barbarian etc.

Do you really expect that all nations throughout umpteen galaxies would all use only the original Bitcoins developed by the Hacker nation?

That the Hacker nation would never pass on that technology to anyone else - such as the Martians for example?

Do you want all games that have anyhing to do with Bitcoins to be illegal in umpteen states of the USA due to being construed as gambling?

It might well be absolutely necessary to have most games use "chip" or "game credit" currencies internally, only accepting Bitcoins and never cashing out, in order to avoid being classified as gambling instead of merely as virtual objects / data that people can play with however they choose to play with them.

Heck it might even be bad enough merely to allow game currencies to be anonymously traded among players outside of the game, even if no trading of "real actual genuine original bitcoins" was involved whatsoever.

How can you have forex / stock market stuff going on in a game if the game only has one currency?

In the Galactic Milieu it is assumed that if real actual bitcoins as used here on Earth exist among the galaxies they are a currency used by the Hacker nation. No other nation is assumed to be so advanced as to actually somehow manage to get in contact with Earth, in fact most people among the galaxies believe "the planet known as Earth" to be fictional.

(Think about it from the perspective of a Freeciv nation, when through most of Freeciv's history 30 nations was the max a planet could have plus very very seldom did the game get won peacefully, usually one nation or maybe a small alliance wiped out all other nations. A planet with a few hundred nations on it is crazy, obviously a myth. They would destroy each other, maybe even destroy the planet...)

Sheesh what is with you people? Why the heck should characters in games all use the same blockchain that real people outside of games use? Does that even make any sense at all? Without hypothesizing some totally weirdly high tech (maybe indistinguishable from magick) enabler such as the (possibly also thought to be fictional just like Earth itself is thought to be) Hacker nation?

Have you ever tried selling in-game objects on e-bay etc?

It is a can of worms at the best of times. If you want to play poker roulette etc go to a casino. This is a roleplaying game. Roles include such roles as operators of block chain type currencies similar to Bitcoin. Get over it.

Or okay, how about this, DONATE REAL BITCOINS for the game to give to players whose computer labs are dedicated to processing blockchains / transactions but who have no actual real-Earth GPUs corresponding to their massive in-game computer facilities...

Commit to hand over real bitcoins for all the players who characters are running computer facilities to receive as their game-computer-tech earnings and maybe we can dispense with the use of alternate currencies in the game...